How to use References() with specifying different type?

[Ephasme]

I want to use Optional references with LanguageExt but I can't use Option<Something> Something {get;set;} with the mapping References(x => x.Something).CustomType(typeof(Something))
How could I do this?

I asked this very question on SO : https://stackoverflow.com/questions/54747437/
It's more complete than here.

[hazzik]

Answered by the @Ephasme:

I finally found a solution:

References(x => x.Sunroof, "idSunroof")
    .Access.CamelCaseField(Prefix.Underscore)
    .Class<Window>();

[hazzik]

To elaborate on the answer. CustomType is for value types. References is to make a reference to an entity.